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Finding the Fourth Proportional to 72,989.40, 109,403.10 and 28,601.40

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Solution

The fourth proportional to 72,989.40, 109,403.10 and 28,601.40 is: 42,870.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,989.40 : 109,403.10 = 28,601.40 : x
  2. Step 2: Convert to fraction form
    72,989.40/109,403.10 = 28,601.40/x
  3. Step 3: Cross multiply
    72,989.40x = 109,403.10 × 28,601.40
  4. Step 4: Simplify right side
    72,989.40x = 3,129,081,824.34
  5. Step 5: Solve for x
    x = 3,129,081,824.34/72,989.40
  6. Step 6: Final answer
    x = 42,870.36

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.